Brush.



UNITED sTATEs 'PATENT oEEioi GEORGE A. THORNTON, SCH-ENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

BRUSH.`

No. senese Specification of Letters Patent.

:Patented may '7, 3.9m.

Application filed September 11,1906. Serial No. 334,184.

To (LH :uli/m11, t may concern:

Be it known that I, GEORGE A. THORNTON, ey citizen of the United Sta-tes, residing` et Schenectady, countyT of Schenectady, State of New York, have invented certain 4new and uselul improvements in Brushes, ot which the following is t speeiiication. I

My invention relates to brushes for dynamo-electric 'machines and hns .i or its object to improve the seme.

ft sometimes desirable to provide :i csrhon 'crush with a motel plate adopted to "ne engaged 'oy the iollower so es to protect the l end oi the brush; hut dillieulty has hereton i'ore heen experienced in securing such e plate cil'cctivelv in place in n simple and cheep manner.

ln one ot its aspects my invention may he considered as relating to novel i'orm oi protective device and ineens Yfor securing it to thc hriish, wiierehy :t reliable electrical and mechanical union netween the parts is read ily obtained,

"Bly improved protective device may he used to advantage to secure a pig-tail tothe brush and therefore, in ad'urther aspect oi my invention, itinay he considered as consisting` of it `novel ineai'is for and method of connecting a pig-tail tosJ lnush.

For a full understanding ol my invention and of its objects and advantages, reference is to he had to the following detailed descrip-` tion taken in connection with the Meetups-. nving drawing'. The scope ol ni'y invention, is, l'iowever, deiiiicd, 'in the appended claims.

ln the drawing, Figure 1 shows in perspec-A tive :i hrush sind a protective plate ready toc( be placed upon the hrush :ind'seeured thereto; Fig. 2 is s view siinilnr to Fig. l, showing:r in addition :i-pig-tail and the manner in which the protective plate co-acts with the pig-tail to secure it in place; Fig. 3 shows the several ineiiihers illustrated .in Fig, 2 united into one` complete whole g :nid Fig. ll is it further modi- 'licfttioir Reference being had to Figs. 1MB of the drawing, l indicates :i czii'hon brush of any suitable type, and 2 is it strip of ganze or a perforated plate, consistingl preferably of copper yand having` prel'ciah y the saine shape as the top of the hriisli. C) is a pig-teil made up of a number of iine strands which are preferably sprend out nt one end, as at d, i so es to cover the top of the brush, or st leest l the mejor portion thereof. The 'member 2 is leid upon tcp of the brush in the construction shown in F l or upon the top of 'the portion i of the pig-tail in the construction shown in Fig. 2, and temporarily secured in position on the brush in any suitable manner7 es, vtor exemple, by clamping,` or by ineens of' :i thread' or other suitable binding' member, The end ol the brush upon which the plate is mounted 'hen immersed in :in electro-platingI solution, the 1orusl'i forming one electrode :is is usivl iii electro-platingL The deposited metal, which preferably copper, enters between the meshes ot the gan-:zie stri or into the pertorations of the plete, it pertoriited plate is used, and into intimate enga-gement with the brush, or the strands et the pig-toil and the brush, the case ine.,y be. Also, s hand 5 of the deposited .me

ut i

will bedorniefl fthe the end o;c the crush i l goining the edges ot ,ie inemhcr 3 intimatelyT to the brush. i lni i'oiind that there is 'thus Aiornied a co :nete electricV and i l l chaine-n.1 connectie between severed parts iind, where oi ils are attached in this wav n secure conneetii'in is v 7 obtained. in nei it noci.. ry to sii iis is. iiecessnrj,v

first copper platte th or pig-tails are soi where protective piaVJ dered in piece; but the .entire process, al'ter the mechanical itsseiiihly, includes but the sinwle step oi' electro-plotting. n Figs. 2 Lmid Stlie pig-tail is shown es S 1 i projecting trom the edge oi the brush, but it 'may be led to the brush from the side, as

shown in Fig'. Ll, the end oiE the jnig-tail in this case heiner spread indicated it en,

W hat I chum is new and desire to secure Letters Patent ot the United States, isf- I 1. c'iirbon brush hitvingn nie su n provided with at plurality of pertoiations electropltitcd to one end thereof.

2. A carbon brush lniving a gauze'rnetal Astrip electroplated to one end thereof.

3. A carbon brush having a metal strip rovided with eitorations secured thereto y clectrolytica ly-depositedinetnl extend-` ing into said pertoisitions.

4. in combination, n. carbon brush, sj

trolytically deposited metal he- 

